372 



EXPERIMENTS ON CO-OPERATION. 



They were then watched until a quarter to eight in the 

 evening, during which time one of them had made 

 twenty-six journeys, carrying off a larva each time ; the 

 other forty- two. During this period of about eleven 

 hours, two other ants had come to the cup at which 

 these were working, and the same number to one of the 

 other cups. 



None of these ant s, therefore, though they had found 

 a large number of larvae, more than they could carry in a 

 whole day, summoned any other to their assistance. 



Again, February 7, 1875, I put some larvae in three 

 porcelain cups in the feeding-box of a frame containing 

 a nest of Lasius fiavus, about six inches from the 

 entrance of the frame, and put, at 8 and 8.29 a.m. 

 respectively two ants to the larvae in the left-hand 

 cup. They <?ach carried off a larva and returned as 

 follows : — 



